diff -urN ../busybox-1.23.2.orig/libbb/Kbuild.src ./libbb/Kbuild.src
--- ../busybox-1.23.2.orig/libbb/Kbuild.src 2015-03-23 06:06:55.000000000 +0300
+++ ./libbb/Kbuild.src 2015-09-24 14:17:14.089851461 +0300
@@ -113,6 +113,7 @@
lib-y += xgethostbyname.o
lib-y += xreadlink.o
lib-y += xrealloc_vector.o
+lib-y += mntent_r.o
lib-$(CONFIG_PLATFORM_LINUX) += match_fstype.o
diff -urN ../busybox-1.23.2.orig/libbb/mntent_r.c ./libbb/mntent_r.c
--- ../busybox-1.23.2.orig/libbb/mntent_r.c 1970-01-01 03:00:00.000000000 +0300
+++ ./libbb/mntent_r.c 2015-09-24 14:17:14.089851461 +0300
@@ -0,0 +1,288 @@
+/* Utilities for reading/writing fstab, mtab, etc.
+ Copyright (C) 1995-2000, 2001, 2002, 2003, 2006, 2010, 2011
+ Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ . */
+
+// file extracted from patch 'Bionic Patch V1.0 (Vitaly Greck)':
+// https://busybox-android.googlecode.com/files/patch
+//
+// looks like its based on misc/mntent_r.c from glibc,
+// contains all fixes in current master (2012-03-19),
+// but is not source identical (mostly stuff removed)
+// using the upstream one fails to build
+
+
+#include
+#include
+#include
+#include
+#include
+
+
+/* Prepare to begin reading and/or writing mount table entries from the
+ beginning of FILE. MODE is as for `fopen'. */
+FILE *setmntent (const char *file, const char *mode)
+{
+ /* Extend the mode parameter with "c" to disable cancellation in the
+ I/O functions and "e" to set FD_CLOEXEC. */
+ size_t modelen = strlen (mode);
+ char newmode[modelen + 3];
+ memcpy (newmode, mode, modelen);
+ memcpy (newmode + modelen, "ce", 3);
+ FILE *result = fopen (file, newmode);
+
+ return result;
+}
+
+
+/* Close a stream opened with `setmntent'. */
+int endmntent (FILE *stream)
+{
+ if (stream) /* SunOS 4.x allows for NULL stream */
+ fclose (stream);
+ return 1; /* SunOS 4.x says to always return 1 */
+}
+
+
+/* Since the values in a line are separated by spaces, a name cannot
+ contain a space. Therefore some programs encode spaces in names
+ by the strings "\040". We undo the encoding when reading an entry.
+ The decoding happens in place. */
+static char *
+decode_name (char *buf)
+{
+ char *rp = buf;
+ char *wp = buf;
+
+ do
+ if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '4' && rp[3] == '0')
+ {
+ /* \040 is a SPACE. */
+ *wp++ = ' ';
+ rp += 3;
+ }
+ else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' && rp[3] == '1')
+ {
+ /* \011 is a TAB. */
+ *wp++ = '\t';
+ rp += 3;
+ }
+ else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' && rp[3] == '2')
+ {
+ /* \012 is a NEWLINE. */
+ *wp++ = '\n';
+ rp += 3;
+ }
+ else if (rp[0] == '\\' && rp[1] == '\\')
+ {
+ /* We have to escape \\ to be able to represent all characters. */
+ *wp++ = '\\';
+ rp += 1;
+ }
+ else if (rp[0] == '\\' && rp[1] == '1' && rp[2] == '3' && rp[3] == '4')
+ {
+ /* \134 is also \\. */
+ *wp++ = '\\';
+ rp += 3;
+ }
+ else
+ *wp++ = *rp;
+ while (*rp++ != '\0');
+
+ return buf;
+}
+
+
+/* Read one mount table entry from STREAM. Returns a pointer to storage
+ reused on the next call, or null for EOF or error (use feof/ferror to
+ check). */
+struct mntent *getmntent_r (FILE *stream, struct mntent *mp, char *buffer, int bufsiz)
+{
+ char *cp;
+ char *head;
+
+ do
+ {
+ char *end_ptr;
+
+ if (fgets (buffer, bufsiz, stream) == NULL)
+ {
+ return NULL;
+ }
+
+ end_ptr = strchr (buffer, '\n');
+ if (end_ptr != NULL) /* chop newline */
+ *end_ptr = '\0';
+ else
+ {
+ /* Not the whole line was read. Do it now but forget it. */
+ char tmp[1024];
+ while (fgets (tmp, sizeof tmp, stream) != NULL)
+ if (strchr (tmp, '\n') != NULL)
+ break;
+ }
+
+ head = buffer + strspn (buffer, " \t");
+ /* skip empty lines and comment lines: */
+ }
+ while (head[0] == '\0' || head[0] == '#');
+
+ cp = strsep (&head, " \t");
+ mp->mnt_fsname = cp != NULL ? decode_name (cp) : (char *) "";
+ if (head)
+ head += strspn (head, " \t");
+ cp = strsep (&head, " \t");
+ mp->mnt_dir = cp != NULL ? decode_name (cp) : (char *) "";
+ if (head)
+ head += strspn (head, " \t");
+ cp = strsep (&head, " \t");
+ mp->mnt_type = cp != NULL ? decode_name (cp) : (char *) "";
+ if (head)
+ head += strspn (head, " \t");
+ cp = strsep (&head, " \t");
+ mp->mnt_opts = cp != NULL ? decode_name (cp) : (char *) "";
+ switch (head ? sscanf (head, " %d %d ", &mp->mnt_freq, &mp->mnt_passno) : 0)
+ {
+ case 0:
+ mp->mnt_freq = 0;
+ case 1:
+ mp->mnt_passno = 0;
+ case 2:
+ break;
+ }
+
+ return mp;
+}
+
+struct mntent *getmntent (FILE *stream)
+{
+ static struct mntent m;
+ static char *getmntent_buffer;
+
+ #define BUFFER_SIZE 4096
+ if (getmntent_buffer == NULL) {
+ getmntent_buffer = (char *) malloc (BUFFER_SIZE);
+ }
+
+ return getmntent_r (stream, &m, getmntent_buffer, BUFFER_SIZE);
+ #undef BUFFER_SIZE
+}
+
+
+/* We have to use an encoding for names if they contain spaces or tabs.
+ To be able to represent all characters we also have to escape the
+ backslash itself. This "function" must be a macro since we use
+ `alloca'. */
+#define encode_name(name) \
+ do { \
+ const char *rp = name; \
+ \
+ while (*rp != '\0') \
+ if (*rp == ' ' || *rp == '\t' || *rp == '\n' || *rp == '\\') \
+ break; \
+ else \
+ ++rp; \
+ \
+ if (*rp != '\0') \
+ { \
+ /* In the worst case the length of the string can increase to \
+ four times the current length. */ \
+ char *wp; \
+ \
+ rp = name; \
+ name = wp = (char *) alloca (strlen (name) * 4 + 1); \
+ \
+ do \
+ if (*rp == ' ') \
+ { \
+ *wp++ = '\\'; \
+ *wp++ = '0'; \
+ *wp++ = '4'; \
+ *wp++ = '0'; \
+ } \
+ else if (*rp == '\t') \
+ { \
+ *wp++ = '\\'; \
+ *wp++ = '0'; \
+ *wp++ = '1'; \
+ *wp++ = '1'; \
+ } \
+ else if (*rp == '\n') \
+ { \
+ *wp++ = '\\'; \
+ *wp++ = '0'; \
+ *wp++ = '1'; \
+ *wp++ = '2'; \
+ } \
+ else if (*rp == '\\') \
+ { \
+ *wp++ = '\\'; \
+ *wp++ = '\\'; \
+ } \
+ else \
+ *wp++ = *rp; \
+ while (*rp++ != '\0'); \
+ } \
+ } while (0)
+
+
+/* Write the mount table entry described by MNT to STREAM.
+ Return zero on success, nonzero on failure. */
+int addmntent (FILE *stream, const struct mntent *mnt)
+{
+ struct mntent mntcopy = *mnt;
+ if (fseek (stream, 0, SEEK_END))
+ return 1;
+
+ /* Encode spaces and tabs in the names. */
+ encode_name (mntcopy.mnt_fsname);
+ encode_name (mntcopy.mnt_dir);
+ encode_name (mntcopy.mnt_type);
+ encode_name (mntcopy.mnt_opts);
+
+ return (fprintf (stream, "%s %s %s %s %d %d\n",
+ mntcopy.mnt_fsname,
+ mntcopy.mnt_dir,
+ mntcopy.mnt_type,
+ mntcopy.mnt_opts,
+ mntcopy.mnt_freq,
+ mntcopy.mnt_passno) < 0
+ || fflush (stream) != 0);
+}
+
+
+/* Search MNT->mnt_opts for an option matching OPT.
+ Returns the address of the substring, or null if none found. */
+char *hasmntopt (const struct mntent *mnt, const char *opt)
+{
+ const size_t optlen = strlen (opt);
+ char *rest = mnt->mnt_opts, *p;
+
+ while ((p = strstr (rest, opt)) != NULL)
+ {
+ if ((p == rest || p[-1] == ',')
+ && (p[optlen] == '\0' || p[optlen] == '=' || p[optlen] == ','))
+ return p;
+
+ rest = strchr (p, ',');
+ if (rest == NULL)
+ break;
+ ++rest;
+ }
+
+ return NULL;
+}